Prosecutors in Massachusetts have dropped more than 21,000 low-level drug cases because of a drug lab scandal. A chemist at the lab admitted to tampering with evidence, forging test results and lying about it.

Several local governments have started to include synthetic cannabinoids in their criminal justice drug monitoring programs in an effort to deter their use, after it became clear many people were using the drugs because they knew tests wouldn’t detect them, according to the Director of the University of Maryland’s Center for Substance Abuse Research (CESAR).

Managers in states where marijuana is legal are toughening up their drug policies, according to a new survey. Many employers in these states say they will not hire employees who smoke marijuana on their own time, Bloomberg Business reports.

A year after Tennessee began its welfare drug-testing program, only 55 recipients tested positive for drugs, according to the state’s Department of Human Services. The results are similar to those of other states that have implemented drug-testing programs for people receiving government benefits, according to The Huffington Post.

A bill introduced Wednesday in Ohio’s state legislature would require people applying for welfare to undergo drug screening. If the screening suggested drug use, they would have to take a drug test, ABC News reports.

Drug use among American workers appears to be increasing, based on the results of drug tests. Traces of drugs were found in 3.9 percent of urine tests conducted for employers last year, up from 3.7 percent in 2013, according to The Wall Street Journal.

Swedish researchers report they have developed a breath test that could be used as an alternative to urine drug testing. The test detects many drugs including marijuana, cocaine, heroin and methamphetamine, according to HealthDay.

Doctors and nurses should undergo random drug testing, argues a leading medical ethicist. “I am sorry to say that addiction and the abuse of drugs are not really a part of the discussion about making medicine safer,” says Arthur L. Caplan, PhD.

Researchers at Washington State University are developing a breath test for THC, the psychoactive ingredient in marijuana. The test could be used to determine if a person is driving under the influence of marijuana, according to The Seattle Times.

Some pain specialists are ordering costly, unneeded drug tests for their elderly patients, in order to receive payment from Medicare, The Wall Street Journal reports. These doctors are testing for drugs rarely used by elderly patients, such as heroin, cocaine and PCP.